Tenderloin

Grass-finished Beef Tenderloin. The most tender piece of beef on the animal.
Steaks or Roasts
Tenderloin is best served rare or medium rare, so use a thermometer to make sure it doesn't get cooked past 140°F in the center. If you have guests who like their meat well-done, consider cutting a whole tenderloin into pieces and cooking them to different temperatures to please everybody.